JP2000007372A - Glass for chemical tempering and glass base for magnetic recording medium - Google Patents
Glass for chemical tempering and glass base for magnetic recording mediumInfo
- Publication number
- JP2000007372A JP2000007372A JP17344198A JP17344198A JP2000007372A JP 2000007372 A JP2000007372 A JP 2000007372A JP 17344198 A JP17344198 A JP 17344198A JP 17344198 A JP17344198 A JP 17344198A JP 2000007372 A JP2000007372 A JP 2000007372A
- Authority
- JP
- Japan
- Prior art keywords
- glass
- zro2
- recording medium
- chemical tempering
- zno
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/097—Glass compositions containing silica with 40% to 90% silica, by weight containing phosphorus, niobium or tantalum
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
- C03C21/001—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions
- C03C21/002—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions to perform ion-exchange between alkali ions
Abstract
Description
【発明の属する技術分野】本発明は、化学強化用ガラス
と、この化学強化用ガラスを強化した化学強化ガラス、
さらにこの化学強化ガラスを用いた情報記録媒体用ガラ
ス基板に関する。TECHNICAL FIELD The present invention relates to a chemically strengthened glass, a chemically strengthened glass obtained by strengthening the chemically strengthened glass,
Further, the present invention relates to a glass substrate for an information recording medium using the chemically strengthened glass.
【従来の技術】一般に化学強化ガラスは、ガラス組成中
に含まれるアルカリ金属よりもイオン半径の大きな1価
のイオンを含有する溶融塩中にガラスを浸漬することに
より、ガラス中のアルカリ金属イオンと溶融塩中のイオ
ンとが交換され、ガラス表面に圧縮応力層が形成される
ことによって高強度のガラスが得られるものである。し
たがって、化学強化用ガラスでは、交換されるイオンと
して適量のLi,Naを含む組成物が使用される。従来
公知の化学強化ガラスとしては、米国特許第4156755 号
明細書、特開昭62-187140 号公報、特開平 5-32431号公
報、特開平 8-48537号公報に記載されたものなどがあ
る。上記米国特許第4156755号明細書には、重量%でS
iO2 59〜63%,Al2O3 15〜23%,Li2
O 4〜5.5%,Na2 O 10〜13%,ZrO2
2〜5%を含有し、Na2 O/ZrO2 の重量比が2.
2〜5.5であるガラスが開示されている。上記特開昭
62-187140号公報には、重量%でSiO2 64〜70
%,Al2 O314〜20%,Li2 O 4〜6%,N
a2 O 7〜10%,ZrO2 0〜1.5%,MgO
0〜4%を含有するガラスが開示されている。また、特
開平5-32431号公報には、重量%でSiO2 62〜75
%,Al2 O35〜15%,Li2 O 4〜10%,N
a2 O 4〜12%,ZrO2 5.5〜15%を含有
し、Na2 O/ZrO2 の重量比が0.5〜2.0であ
り、Al2 O3 /ZrO2 の重量比が0.4〜2.5で
あるガラスが開示されている。さらに、特開平8-48537
号公報には、重量%でSiO2 58〜70%,Al2O3
13〜22%,Li2 O 6〜10%,Na2 O 5
〜12%,ZrO2 2〜5%の組成を有するガラスが開
示されている。2. Description of the Related Art In general, chemically strengthened glass is prepared by immersing glass in a molten salt containing monovalent ions having a larger ionic radius than the alkali metal contained in the glass composition, so that the alkali metal ions in the glass are eliminated. High strength glass is obtained by exchanging ions in the molten salt and forming a compressive stress layer on the glass surface. Therefore, in the glass for chemical strengthening, a composition containing appropriate amounts of Li and Na as ions to be exchanged is used. Conventionally known chemically strengthened glasses include those described in U.S. Pat. No. 4,156,755, JP-A-62-187140, JP-A-5-32431, and JP-A-8-48537. U.S. Pat. No. 4,156,755 discloses that in weight percent S
iO2 59-63%, Al2O3 15-23%, Li2
O 4 to 5.5%, Na2O 10 to 13%, ZrO2
2-5%, and the weight ratio of Na2 O / ZrO2 is 2.
Disclosed are glasses that are 2-5.5. The above JP
JP-A 62-187140 discloses that SiO2 is 64 to 70% by weight.
%, Al2 O3 14-20%, Li2 O 4-6%, N
a2 O 7-10%, ZrO2 0-1.5%, MgO
Glasses containing 0-4% are disclosed. Japanese Patent Application Laid-Open No. 5-32431 discloses that SiO2 62 to 75% by weight.
%, Al2 O3 5 to 15%, Li2 O 4 to 10%, N
a2 O 4-12%, ZrO2 5.5-15%, the weight ratio of Na2 O / ZrO2 is 0.5-2.0, and the weight ratio of Al2 O3 / ZrO2 is 0.4-2. No. 5 is disclosed. Further, JP-A-8-48537
In the publication, 58 to 70% by weight of SiO2, Al2 O3
13-22%, Li2 O 6-10%, Na2 O5
Glasses having a composition of about 12% and 2-5% ZrO2 are disclosed.
【発明が解決しようとする課題】化学強化ガラスには様
々な用途があるが、近年では情報記録媒体用基板、特に
磁気ディスク基板として用いられるようになっている。
このような用途では、高温高湿下でも長期間にわたって
表面変質が生じない優れた耐候性が要求される。従来、
化学強化用ガラスとしてはソーダライム系の組成を有す
るフロートガラスが広く使用されてきたが、このガラス
は、化学強化処理を施すと耐候性が著しく悪くなるた
め、情報記録媒体用基板として使用するには信頼性が不
十分であった。耐候性が改善された化学強化用ガラスと
して上記したようなガラスが知られており、情報記録媒
体用基板にも応用が図られている。一方、磁気ディスク
等の記録媒体の記録密度は飛躍的な向上が図られてお
り、これに伴って磁気記録媒体に対する磁気ヘッドの浮
上高は極めて低くなってきている。このため、磁気ディ
スク基板では、基板表面の極めて高い平坦・平滑性が求
められる。普通、情報記録媒体用基板では、表面を精密
研磨して所定の表面性状を得ているが、ガラスの均質性
がこれら製品特性に影響を与えるまでに至っている。す
なわち、均質度の高いガラスでは研磨処理後、基板全体
にわたって均一な平坦度・平滑度が得られるのに対し、
均質性の低いガラスでは平坦度・平滑度に部分的なムラ
や基板間でのばらつきを生じることがある。これは、記
録媒体の高密度化の障害ともなり、また品質保証上重大
な問題となる可能性がある。このような背景に照らす
と、上記米国特許第4156755号明細書および上記特開昭6
2-187140号公報に示されたガラスは、溶融に1600℃
前後の高温を要するため、高均質なガラスの製造には困
難を伴う欠点がある。また、上記特開平 5-32431号公
報、特開平8-48537号公報に記載されたガラスでは、溶
融温度の低下は見られるものの、研磨処理後の基板表面
にはガラスの不均質に起因する表面粗さのばらつきが見
られることがある。一般に量産されるガラスは、耐火物
製の連続溶融炉で溶融されるものが多いが、高温の溶融
ガラスに耐火物が侵食され、耐火物成分の混入によりガ
ラス中に異物や不均質部分を生じる欠点がある。このた
め、高均質が要求される電子・光学用ガラスなどでは、
少量の場合白金るつぼ、多量になると溶融槽内壁を白金
で覆った溶融炉が用いられる。これによって耐火物と溶
融ガラスとの接触がなくなり、上記のようなガラス欠点
のない均質性に優れたガラスを得ることができる。とこ
ろが、白金自体が耐えられる温度に限界があるため、白
金溶融炉で溶融されるガラスは、1460℃以下の温度で溶
融可能なものであることが望ましい。本発明は、このよ
うな事情を考慮してなされたもので、高均質なガラスの
製造が容易な低い溶融温度を有し、化学強化後に優れた
耐候性を有する化学強化用ガラスを提供することを目的
とする。Although chemically strengthened glass has various uses, in recent years it has been used as a substrate for an information recording medium, particularly a magnetic disk substrate.
In such applications, excellent weather resistance that does not cause surface deterioration for a long time even under high temperature and high humidity is required. Conventionally,
Float glass having a soda-lime composition has been widely used as a glass for chemical strengthening.However, this glass is significantly deteriorated in weather resistance when subjected to chemical strengthening treatment. Was not sufficiently reliable. The above-mentioned glass is known as a glass for chemical strengthening having improved weather resistance, and is also applied to a substrate for an information recording medium. On the other hand, the recording density of a recording medium such as a magnetic disk has been dramatically improved, and the flying height of the magnetic head with respect to the magnetic recording medium has become extremely low. For this reason, magnetic disk substrates are required to have extremely high flatness and smoothness on the substrate surface. Normally, the surface of an information recording medium substrate is precisely polished to obtain a predetermined surface property, but the homogeneity of the glass has reached such a level as to affect the product characteristics. In other words, in the case of glass having a high degree of homogeneity, after the polishing treatment, uniform flatness / smoothness can be obtained over the entire substrate,
Glass with low homogeneity may cause partial unevenness in flatness and smoothness and variation between substrates. This may be an obstacle to increasing the density of the recording medium, and may be a serious problem in quality assurance. In light of this background, US Pat. No. 4,156,755 and US Pat.
The glass disclosed in JP 2-187140 is melted at 1600 ° C.
Since high and low temperatures are required, production of highly homogeneous glass has drawbacks accompanied by difficulties. Further, in the glasses described in JP-A-5-32431 and JP-A-8-48537, although a decrease in the melting temperature is observed, the surface of the substrate after the polishing treatment is caused by the inhomogeneity of the glass. There may be variations in roughness. Generally, mass-produced glass is often melted in a continuous melting furnace made of refractories, but refractories are eroded by high-temperature molten glass, and foreign matter and inhomogeneous parts are generated in the glass due to mixing of refractory components. There are drawbacks. For this reason, in glass for electronic and optical applications that require high homogeneity,
When the amount is small, a platinum crucible is used, and when the amount is large, a melting furnace in which the inner wall of the melting tank is covered with platinum is used. Thereby, contact between the refractory and the molten glass is eliminated, and a glass excellent in homogeneity without the above-mentioned glass defects can be obtained. However, since there is a limit to the temperature that platinum itself can withstand, it is desirable that the glass to be melted in a platinum melting furnace can be melted at a temperature of 1460 ° C. or less. The present invention has been made in view of such circumstances, and provides a glass for chemical strengthening that has a low melting temperature at which a highly homogeneous glass can be easily produced and has excellent weather resistance after chemical strengthening. With the goal.
【課題を解決するための手段】本発明は上記目的を達成
するために、高温粘性を高める作用をもつZrO2 の含
有量を低く抑えるとともに、耐候性を高め、化学強化を
促進するために所定量のZnOおよびP2 O5 を含有さ
せたものである。すなわち本発明は、質量%で、SiO
2 58〜65%,Al2 O3 8〜15%,Li2 O 4
〜10%,Na2 O 9〜13%,ZrO2 0.5〜2
%,ZnO 2〜5%,P2 O5 0.5〜2%の組成を
有することを特徴とする化学強化用ガラスである。好ま
しくは、質量%で、SiO2 58〜65%,Al2 O3
9〜12%,Li2 O 5〜9%,Na2 O 10〜1
3%,ZrO2 0.5〜1.8%,ZnO2.5〜4.
5%,P2 O5 0.7〜1.8%の組成を有することを
特徴とする。上記ガラスを構成する成分の作用と組成範
囲の限定理由について説明すると、SiO2 はガラスを
形成する主成分であるが、58%未満では化学的耐久性
が悪く、65%を越えると溶融温度が高くなり過ぎるの
で、いずれの場合も本発明の目的達成にそぐわない。A
l2 O3 はイオン交換速度を速め、またガラスの耐水性
を向上させる作用をもつが、8%未満ではその効果が十
分でなく、15%を越えるとガラス融液の粘性が高くな
りすぎ溶融が困難となる。好ましくは9〜12%の範囲
である。Li2 Oはイオン交換に必要な成分であるとと
もに溶融性を高める作用を有するが、4%未満ではイオ
ン交換後の十分な圧縮応力が得られず、溶融性も悪い、
一方10%を越えて含有すると化学的耐久性が悪化する
ので好ましくない。好ましくは5〜9%の範囲である。
Na2 OはLi2 Oと同様イオン交換に必要な成分であ
り、溶融性を高める成分であるが、9%未満ではその効
果は不十分であり、13%を越えると化学的耐久性が悪
化する。ZrO2 はイオン交換速度を速め、ガラスの耐
水性改善にも寄与するが、0.5%未満ではその効果が
得られず、2%を越えると溶融温度が高くなりすぎ、均
質なガラスが得にくくなる。好ましくは上限を1.8%
までとする。ZnOは溶融温度を上昇させることなくイ
オン交換速度を速め、耐水性を向上させるが、2%未満
ではその効果が得られず、5%を越えると加工性が悪く
なる。好ましくは2.5〜4.5%の範囲である。P2
O5 はイオン交換速度を速めるとともに均質なガラス化
を促進する溶融助剤としての作用も期待できるが、0.
5%未満ではその効果がなく、2%を越えるとガラスが
失透しやすくなるので好ましくない。好ましくは0.7
〜1.8%の範囲である。以上のほか、本発明のガラス
には所望の特性を損なわない範囲で清澄剤として通常使
用されるAs2 O3 ,Sb2 O3 ,F,Cl等を含有さ
せることができる。上述の組成範囲に入るよう調整され
た本発明のガラスは、イオン交換が容易で、イオン交換
による強化処理後も優れた耐候性を示す。また、本発明
のガラスは、ガラスの粘度が10Pa・sとなる温度が
1460℃以下であることを特徴とする。この温度は、
通常、炭化珪素発熱体を使用した白金ガラス溶融炉で溶
融可能な温度のほぼ上限にあたり、1460℃以下で溶
融可能としたことにより、従来の一般的な溶融設備での
高均質ガラスの製造が可能となる。また、ガラスの粘度
が10Pa・sとなる温度がこれより高温になると、成
分揮発等によりガラスの均質性が損なわれ、本発明の目
的達成が困難になるため好ましくない。また、本発明
は、請求項1または2のいずれかに記載の化学強化用ガ
ラスを、少なくともNaイオン、Kイオンのいずれかを
含有する処理浴でイオン交換して化学強化したことを特
徴とする化学強化ガラスである。この化学強化ガラス
は、上記化学強化用ガラスをイオン交換処理することに
よって得られる。上記化学強化用ガラスは、Li2 O,
Na2 Oを含有するので、Naイオンを含む処理浴では
ガラス中のLiイオンがNaイオンと、Kイオンを含む
処理浴ではガラス中のNaイオンがKイオンと、Na、
K両イオンを含む処理浴では前記と同様の両イオン交換
反応が生じ、イオン半径の相違によりガラス表面に圧縮
応力層が形成されることによって容易に化学強化され
る。さらに、本発明は、前記のガラスを用いたことを特
徴とする情報記録媒体用基板である。本発明の情報記録
媒体用基板は、上述のとおり、比較的低温での溶融が可
能なため、極めて均質なガラスが得られ、これにより研
磨後の基板表面においても極めて高い平坦・平滑性が得
られる。また耐水性に優れるので、情報記録媒体用基板
としての信頼性も高いものとなる。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention suppresses the content of ZrO2, which has the effect of increasing the viscosity at high temperatures, while increasing the amount of ZrO2 to increase weather resistance and promote chemical strengthening. Of ZnO and P2 O5. That is, the present invention relates to a method for producing SiO 2 by mass%.
2 58-65%, Al2 O3 8-15%, Li2 O4
-10%, Na2O 9-13%, ZrO2 0.5-2
%, ZnO 2 to 5%, and P2 O5 0.5 to 2%. Preferably, in mass%, SiO2 58-65%, Al2 O3
9-12%, Li2 O 5-9%, Na2 O 10-1
3%, ZrO2 0.5-1.8%, ZnO 2.5-4.
It is characterized in that it has a composition of 5% and P2 O5 0.7 to 1.8%. Explaining the action of the components constituting the glass and the reasons for limiting the composition range, SiO2 is the main component forming the glass. If it is less than 58%, the chemical durability is poor, and if it exceeds 65%, the melting temperature is high. In any case, it does not meet the purpose of the present invention. A
l2 O3 has the effect of increasing the ion exchange rate and improving the water resistance of the glass. However, if it is less than 8%, the effect is not sufficient, and if it exceeds 15%, the viscosity of the glass melt becomes too high and melting is difficult. Becomes Preferably it is in the range of 9 to 12%. Li2O is a component necessary for ion exchange and has an effect of enhancing the meltability. However, if it is less than 4%, sufficient compressive stress after ion exchange cannot be obtained, and the meltability is poor.
On the other hand, if the content exceeds 10%, the chemical durability deteriorates, which is not preferable. Preferably it is in the range of 5 to 9%.
Na2O is a component necessary for ion exchange like Li2O and is a component for improving the melting property. However, if it is less than 9%, its effect is insufficient, and if it exceeds 13%, the chemical durability deteriorates. ZrO2 increases the ion exchange rate and also contributes to improving the water resistance of the glass. However, if it is less than 0.5%, the effect cannot be obtained. If it exceeds 2%, the melting temperature becomes too high, and it is difficult to obtain a homogeneous glass. Become. Preferably the upper limit is 1.8%
Up to. ZnO increases the ion exchange rate without increasing the melting temperature and improves the water resistance. However, if it is less than 2%, the effect cannot be obtained, and if it exceeds 5%, the workability deteriorates. Preferably, it is in the range of 2.5 to 4.5%. P2
O5 can be expected to act as a melting aid to increase the ion exchange rate and promote uniform vitrification.
If it is less than 5%, the effect is not obtained, and if it exceeds 2%, the glass tends to be devitrified, which is not preferable. Preferably 0.7
範 囲 1.8%. In addition to the above, the glass of the present invention can contain As2 O3, Sb2 O3, F, Cl, etc., which are usually used as fining agents, as long as the desired properties are not impaired. The glass of the present invention adjusted to fall within the above-mentioned composition range is easily ion-exchanged and shows excellent weather resistance even after strengthening treatment by ion exchange. Further, the glass of the present invention is characterized in that the temperature at which the viscosity of the glass becomes 10 Pa · s is 1460 ° C. or less. This temperature is
Normally, the melting point is almost the upper limit of the melting temperature in a platinum glass melting furnace using a silicon carbide heating element, and it is possible to melt at 1460 ° C or less, making it possible to produce highly homogeneous glass with conventional general melting equipment. Becomes On the other hand, if the temperature at which the viscosity of the glass becomes 10 Pa · s is higher than this, the homogeneity of the glass is impaired due to volatilization of components and the like, and it is difficult to achieve the object of the present invention. Further, the present invention is characterized in that the glass for chemical strengthening according to any one of claims 1 and 2 is chemically strengthened by ion exchange in a treatment bath containing at least one of Na ions and K ions. It is chemically strengthened glass. This chemically strengthened glass is obtained by subjecting the glass for chemical strengthening to an ion exchange treatment. The glass for chemical strengthening is Li2O,
Since Na 2 O is contained, in a treatment bath containing Na ions, Li ions in glass are Na ions, and in a treatment bath containing K ions, Na ions in glass are K ions, Na,
In a treatment bath containing both K ions, a both ion exchange reaction similar to the above occurs, and a chemical stress is easily strengthened by forming a compressive stress layer on the glass surface due to a difference in ionic radius. The present invention further provides an information recording medium substrate using the above-mentioned glass. As described above, since the substrate for an information recording medium of the present invention can be melted at a relatively low temperature, an extremely homogeneous glass can be obtained, and thus a very high flatness and smoothness can be obtained even on the substrate surface after polishing. Can be Further, since it has excellent water resistance, the reliability as a substrate for an information recording medium is also high.
【発明の実施の形態】以下、本発明の実施の形態につい
て説明する。本発明の化学強化用ガラスは、次のように
して作製できる。まず上記組成範囲、たとえば、SiO
2 62.5%,Al2 O3 13.0%,Li2 O 6.
0%,Na2 O 12.0%,ZrO2 1.5%,Z
nO 3.0%,P2 O5 1.5%,Sb2 O3 0.5
%の組成となるように、通常ガラス原料として使用され
る酸化物、炭酸塩、硝酸塩、水酸化物等を秤量・混合す
る。この原料混合物1kgを1lの白金るつぼに収容
し、電気炉内において1450℃の温度で6時間加熱溶
融する。十分に撹拌、清澄させた後、型内に鋳込み、徐
冷することによってガラスを得る。得られたガラスは、
スライス、研磨などの加工を経て所定の製品形状に成形
する。次に、イオン交換処理は、試薬第1級の硝酸ナト
リウム40%と試薬第1級の硝酸カリウム60%との混
合溶融塩中にガラスを浸漬し、380℃で3時間保持し
て行う。なお、イオン交換を行う処理浴は、硝酸塩以外
でも硫酸塩、炭酸塩、ハロゲン化物等を用いてもよい。
情報記録媒体用基板、たとえば、磁気ディスク基板とす
る場合には、上記化学強化用ガラスを中心部に孔のある
円盤状に成形し、盤面を研磨した後、前記と同様のイオ
ン交換処理により化学強化ガラスからなる磁気ディスク
基板を得る。Embodiments of the present invention will be described below. The glass for chemical strengthening of the present invention can be produced as follows. First, the above composition range, for example, SiO 2
262.5%, Al2O3 13.0%, Li2O6.
0%, Na2O 12.0%, ZrO2 1.5%, Z
nO 3.0%, P2 O5 1.5%, Sb2 O3 0.5
%, Oxides, carbonates, nitrates, hydroxides and the like, which are usually used as glass raw materials, are weighed and mixed so as to have a composition of%. 1 kg of this raw material mixture is placed in a 1-liter platinum crucible, and heated and melted at 1450 ° C. for 6 hours in an electric furnace. After sufficiently stirring and refining, the mixture is cast into a mold and slowly cooled to obtain a glass. The resulting glass is
It is formed into a predetermined product shape through processing such as slicing and polishing. Next, the ion exchange treatment is performed by immersing the glass in a mixed molten salt of 40% of the reagent first-grade sodium nitrate and 60% of the reagent first-grade potassium nitrate, and holding the glass at 380 ° C. for 3 hours. The treatment bath for performing the ion exchange may use a sulfate, a carbonate, a halide or the like other than the nitrate.
In the case of a substrate for an information recording medium, for example, a magnetic disk substrate, the above-mentioned glass for chemical strengthening is formed into a disk having a hole at the center, and the disk surface is polished. A magnetic disk substrate made of tempered glass is obtained.
【実施例】さらに、実施例により本発明を詳細に説明す
る。表1に本発明の実施例を、表2に従来ガラスからな
る比較例を示す。表2の比較例1は米国特許第4156755
号明細書のExample No. 18に記載されたガラス、比較
例2は特開昭62-187140号公報の実施例1のガラス、比
較例3は特開平5-32431号公報の実施例4のガラス、比
較例4は特開平8-48537号公報の実施例3のガラスであ
る。表中の組成は質量%で示し、それぞれ上記実施の形
態と同様の方法で、表中の組成となるように秤量・混合
した原料を白金るつぼで溶融して型内に鋳込み、化学強
化用ガラスの試料を得た。なお、溶融ガラス中に白金ロ
ーターを挿入して、その回転トルクから高温粘性を求
め、ガラスの粘度が10Pa・sとなった時点の温度を
「溶融点」として表中に記載した。得られた化学強化用
ガラス試料は、厚さ0.635mm,外径65mmで中
心部に直径20mmの孔を有する円盤状に成形し、板面
を鏡面研磨した後、上記実施の形態と同様にしてイオン
交換し、磁気ディスク基板状の化学強化ガラス試料とし
た。化学強化ガラス各試料の表面応力と表面応力層深さ
は、偏光顕微鏡を用いて測定した。また耐水性は、光学
硝子工業会規格の粉末法にしたがって測定した。これら
の測定結果も合わせて表中に示す。EXAMPLES Further, the present invention will be described in detail with reference to examples. Table 1 shows Examples of the present invention, and Table 2 shows Comparative Examples made of conventional glass. Comparative Example 1 in Table 2 is described in US Pat. No. 4,156,755.
Comparative Example 2 is the glass of Example 1 of JP-A-62-187140, and Comparative Example 3 is the glass of Example 4 of JP-A-5-32431. Comparative Example 4 is the glass of Example 3 in JP-A-8-48537. The compositions in the table are shown in mass%, and the raw materials weighed and mixed to obtain the compositions in the table are melted in a platinum crucible and cast into a mold in the same manner as in the above-described embodiment, and the glass for chemical strengthening is used. Sample was obtained. In addition, the platinum rotor was inserted into the molten glass, the high-temperature viscosity was determined from the rotation torque, and the temperature at which the viscosity of the glass became 10 Pa · s was described as “melting point” in the table. The obtained glass sample for chemical strengthening was formed into a disk shape having a thickness of 0.635 mm, an outer diameter of 65 mm, and a hole having a diameter of 20 mm in the center, and the plate surface was mirror-polished, and then the same as in the above embodiment. The sample was ion-exchanged to obtain a chemically strengthened glass sample on a magnetic disk substrate. The surface stress and the surface stress layer depth of each sample of the chemically strengthened glass were measured using a polarizing microscope. The water resistance was measured according to the powder method specified by the Optical Glass Industry Association. The results of these measurements are also shown in the table.
【表1】 [Table 1]
【表2】 以上の結果から、本実施例のガラスは耐水性、表面応力
層深さ、表面応力においては比較例と同等の優れた特性
を示し、イオン交換性、化学強化後の強度および耐水性
で実用上十分な性能を有することがわかる。また、本実
施例のガラスはいずれも1460℃以下の低い溶融点を
有し、白金溶融炉において高均質なガラスを得ることが
できる。これに対し、比較例のガラスは溶融点が高いた
め、品質にばらつきが出やすく、白金溶融炉における溶
融も難しい。[Table 2] From the above results, the glass of this example exhibits excellent properties equivalent to those of the comparative example in terms of water resistance, surface stress layer depth, and surface stress, and has practically improved ion exchangeability, strength after chemical strengthening, and water resistance. It turns out that it has sufficient performance. Further, each of the glasses of this example has a low melting point of 1460 ° C. or less, and a highly homogeneous glass can be obtained in a platinum melting furnace. On the other hand, since the glass of the comparative example has a high melting point, the quality tends to vary, and melting in a platinum melting furnace is also difficult.
【発明の効果】以上のように本発明によれば、化学強化
後も優れた耐水性を保ち、かつ十分な強度を有する化学
強化用ガラスを低い溶融温度で得ることができるので、
高均質なガラスを経済的に生産できる。また、この化学
強化用ガラスを化学強化して得られる本発明の化学強化
ガラスは、耐水性が良好で、薄板でも十分な強度を有す
る。さらに、この化学強化ガラスを用いた情報記録媒体
用基板は、ガラスの均質性が高いため、基板表面の極め
て高い平坦・平滑性が得られ、磁気ヘッドの低浮上化、
高記録密度化に貢献できる。また耐水性に優れることか
ら保管時の品質低下がなく、基板表面に成膜される磁気
記録膜に対する影響も抑えられ、記録媒体としたときの
信頼性が向上する。As described above, according to the present invention, it is possible to obtain a glass for chemical strengthening which has excellent water resistance after chemical strengthening and has sufficient strength at a low melting temperature.
Highly homogeneous glass can be produced economically. Further, the chemically strengthened glass of the present invention obtained by chemically strengthening the glass for chemical strengthening has good water resistance, and has sufficient strength even with a thin plate. Furthermore, since the substrate for information recording media using this chemically strengthened glass has a high homogeneity of the glass, an extremely high flatness and smoothness of the substrate surface can be obtained, and a low flying height of the magnetic head,
It can contribute to higher recording density. In addition, since it is excellent in water resistance, there is no deterioration in quality during storage, the influence on the magnetic recording film formed on the substrate surface is suppressed, and the reliability as a recording medium is improved.
─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成10年8月20日(1998.8.2
0)[Submission date] August 20, 1998 (1998.8.2
0)
【手続補正1】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】発明の名称[Correction target item name] Name of invention
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【発明の名称】 化学強化用ガラス及び磁気記
録媒体用ガラス基板Patent application title: Chemical strengthening glass and glass substrate for magnetic recording medium
───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 4G059 AA20 AC30 HB03 HB13 HB14 4G062 AA01 BB01 DA06 DB03 DB04 DC01 DD02 DD03 DE03 DF01 EA03 EB03 EB04 EC01 ED01 EE01 EF01 EG01 FA01 FB01 FC02 FC03 FD01 FE01 FF01 FG01 FH01 FJ01 FK01 FL01 GA01 GA10 GB01 GC01 GD01 GE01 HH01 HH03 HH05 HH07 HH09 HH11 HH13 HH15 HH17 HH20 JJ01 JJ03 JJ05 JJ07 JJ10 KK01 KK03 KK05 KK07 KK10 MM27 NN34 5D006 CB04 CB07 DA03 FA03 FA09 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4G059 AA20 AC30 HB03 HB13 HB14 4G062 AA01 BB01 DA06 DB03 DB04 DC01 DD02 DD03 DE03 DF01 EA03 EB03 EB04 EC01 ED01 EE01 EF01 EG01 FA01 FB01 FC02 FC03 FD01 FG01 F01 GA10 GB01 GC01 GD01 GE01 HH01 HH03 HH05 HH07 HH09 HH11 HH13 HH15 HH17 HH20 JJ01 JJ03 JJ05 JJ07 JJ10 KK01 KK03 KK05 KK07 KK10 MM27 NN34 5D006 CB04 CB07 DA03 FA03 FA09
Claims (7)
2 O3 8〜15%,Li2 O 4〜10%,Na2 O
9〜13%,ZrO2 0.5〜2%,ZnO 2〜5
%,P2 O5 0.5〜2%の組成を有することを特徴と
する化学強化用ガラス。1. A method according to claim 1, wherein the content of SiO2 is from 58 to 65% by mass,
2 O3 8-15%, Li2 O 4-10%, Na2 O
9-13%, ZrO2 0.5-2%, ZnO 2-5
%, P2O5 0.5 to 2%.
2 O3 9〜12%,Li2 O 5〜9%,Na2 O 1
0〜13%,ZrO2 0.5〜1.8%,ZnO2.5
〜4.5%,P2 O5 0.7〜1.8%の組成を有する
ことを特徴とする化学強化用ガラス。2. The composition according to claim 1, wherein the content of SiO2 is from 58 to 65% by weight,
2 O3 9-12%, Li2 O 5-9%, Na2 O1
0-13%, ZrO2 0.5-1.8%, ZnO2.5
Glass for chemical strengthening characterized by having a composition of about 4.5% and P2 O5 of 0.7 to 1.8%.
が、1460℃以下であることを特徴とする請求項1ま
たは2に記載の化学強化用ガラス。3. The glass for chemical strengthening according to claim 1, wherein the temperature at which the viscosity of the glass becomes 10 Pa · s is 1460 ° C. or less.
学強化用ガラスを、少なくともNaイオン、Kイオンの
いずれかを含有する処理浴でイオン交換して化学強化し
たことを特徴とする化学強化ガラス。4. The chemical strengthening glass according to claim 1, wherein the glass for chemical strengthening is ion-exchanged in a treatment bath containing at least one of Na ions and K ions. Tempered glass.
とする磁気記録媒体用ガラス基板。5. A glass substrate for a magnetic recording medium having the composition according to claim 1.
とする磁気記録媒体用ガラス基板。6. A glass substrate for a magnetic recording medium having the composition according to claim 2.
ことを特徴とする磁気記録媒体用ガラス基板。7. A glass substrate for a magnetic recording medium, wherein the chemically strengthened glass according to claim 4 is used.
Priority Applications (1)
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---|---|---|---|
JP17344198A JP2000007372A (en) | 1998-06-19 | 1998-06-19 | Glass for chemical tempering and glass base for magnetic recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17344198A JP2000007372A (en) | 1998-06-19 | 1998-06-19 | Glass for chemical tempering and glass base for magnetic recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2000007372A true JP2000007372A (en) | 2000-01-11 |
Family
ID=15960539
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17344198A Pending JP2000007372A (en) | 1998-06-19 | 1998-06-19 | Glass for chemical tempering and glass base for magnetic recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2000007372A (en) |
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